Modifying firmware voids your warranty. Proceed at your own risk. If you'd like to continue with the update process:
The router will reboot several times. Do not unplug it. Method 2: USB Flashing (For Bricked or Locked Units) huawei b311s220 unlock firmware upd
The Huawei B311s-220 is a popular 4G LTE wireless gateway, but many units are sold "locked" to specific carriers like Optus, Telkom, or EE. Finding a reliable firmware update to unlock this device allows you to use any SIM card globally. Modifying firmware voids your warranty
After unlocking, you must manually enter the APN settings for your new carrier under the "Dial-up" menu. huawei b311s220 unlock firmware upd